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E4-130, E4-250power amplifier
user manual
Musikhaus Thomann e.K.
Treppendorf 30
96138 Burgebrach
Germany
Telephone: +49 (0) 9546 9223-0
E-mail: [email protected]
Internet: www.thomann.de
30.10.2014, ID: 348232, 348233
Table of contents
1 General information................................................................................................................................. 41.1 Further information........................................................................................................................... 51.2 Notational conventions.................................................................................................................... 61.3 Symbols and signal words............................................................................................................... 6
2 Safety notes.................................................................................................................................................. 8
3 Features....................................................................................................................................................... 13
4 Installation and operation.................................................................................................................. 14
5 Connections and operating elements........................................................................................... 18
6 Technical specifications....................................................................................................................... 24
7 Plug and connection assignment.................................................................................................... 26
8 Cleaning....................................................................................................................................................... 29
9 Protecting the environment.............................................................................................................. 30
Table of contents
E4-130, E4-250
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1 General information
This manual contains important instructions for the safe operation of the unit. Read and followthe safety instructions and all other instructions. Keep the manual for future reference. Makesure that it is available to all those using the device. If you sell the unit please make sure thatthe buyer also receives this manual.
Our products are subject to a process of continuous development. Thus, they are subject tochange.
General information
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1.1 Further information
On our website (www.thomann.de) you will find lots of further information and details on thefollowing points:
Download This manual is also available as PDF file for you to download.
Keyword search Use the search function in the electronic version to find the topics ofinterest for you quickly.
Online guides Our online guides provide detailed information on technical basicsand terms.
Personal consultation For personal consultation please contact our technical hotline.
Service If you have any problems with the device thecustomer service will gladly assist you.
General information
E4-130, E4-250
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1.2 Notational conventions
This manual uses the following notational conventions:
The letterings for connectors and controls are marked by square brackets and italics.
Examples: [VOLUME] control, [Mono] button.
1.3 Symbols and signal words
In this section you will find an overview of the meaning of symbols and signal words that areused in this manual.
Letterings
General information
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Signal word Meaning
DANGER! This combination of symbol and signal word indicates animmediate dangerous situation that will result in death orserious injury if it is not avoided.
CAUTION! This combination of symbol and signal word indicates a pos‐sible dangerous situation that can result in minor injury if itis not avoided.
NOTICE! This combination of symbol and signal word indicates a pos‐sible dangerous situation that can result in material andenvironmental damage if it is not avoided.
Warning signs Type of danger
Warning – high-voltage.
Warning – danger zone.
General information
E4-130, E4-250
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2 Safety notes
This device amplifies electric audio frequency signals to operate passive speakers. Use thedevice only as described in this user manual. Any other use or use under other operating con‐ditions is considered to be improper and may result in personal injury or property damage. Noliability will be assumed for damages resulting from improper use.
This device may be used only by persons with sufficient physical, sensorial, and intellectualabilities and having corresponding knowledge and experience. Other persons may use thisdevice only if they are supervised or instructed by a person who is responsible for their safety.
DANGER!Danger for childrenEnsure that plastic bags, packaging, etc. are disposed of properly and are notwithin reach of babies and young children. Choking hazard!
Ensure that children do not detach any small parts (e.g. knobs or the like) fromthe unit. They could swallow the pieces and choke!
Never let children unattended use electrical devices.
Intended use
Safety
Safety notes
power amplifier
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DANGER!Electric shock caused by high voltages insideWithin the device there are areas where high voltages may be present. Neverremove any covers.
There are no user-serviceable parts inside.
DANGER!Electric shock caused by short-circuitAlways use proper ready-made insulated mains cabling (power cord) with a pro‐tective contact plug. Do not modify the mains cable or the plug. Failure to do socould result in electric shock/death or fire. If in doubt, seek advice from a regis‐tered electrician.
Safety notes
E4-130, E4-250
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CAUTION!Possible hearing damageWith loudspeakers or headphones connected, the device can produce volumelevels that may cause temporary or permanent hearing impairment.
Do not operate the device permanently at a high volume level. Decrease thevolume level immediately if you experience ringing in your ears or hearingimpairment.
NOTICE!Risk of fireDo not cover the device nor any ventilation slots. Do not place the device nearany direct heat source. Keep the device away from naked flames.
Safety notes
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NOTICE!Operating conditionsThis device has been designed for indoor use only. To prevent damage, neverexpose the device to any liquid or moisture. Avoid direct sunlight, heavy dirt, andstrong vibrations.
NOTICE!Power supplyBefore connecting the device, ensure that the input voltage (AC outlet) matchesthe voltage rating of the device and that the AC outlet is protected by a residualcurrent circuit breaker. Failure to do so could result in damage to the device andpossibly injure the user.
Unplug the device before electrical storms occur and when it is unused for longperiods of time to reduce the risk of electric shock or fire.
Safety notes
E4-130, E4-250
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NOTICE!Magnetic fieldsThe device generates strong magnetic fields that can interfere with the functionof poorly shielded devices. The strongest magnetic fields are directly above andbelow the power amplifier. Therefore, never place sensitive devices such as pre-amplifiers, radio transmission systems, or tape decks directly above or below thepower amplifier. When installing the power amplifier into a rack, you should placeit in the lowest position, and further equipment such as pre-amplifiers in thehighest position.
Safety notes
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3 Features
n Low mounting depth of only 408 mmn Output power
– the t.amp E4-130 (item no. 348232):4 × 130 W @ 4 Ω, 2 × 200 W @ 8 Ω
– the t.amp E4-250 (item no. 348233):4 × 250 W @ 4 Ω, 4 × 400 W @ 8 Ω
n Inputs: XLRn Outputs: NL4 (speakON) connectors for speakersn Protection circuits: DC, short circuit, overtemperature, limiter, soft startn Defeatable standby function
Features
E4-130, E4-250
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4 Installation and operation
Unpack and carefully check that there is no transportation damage before using the unit. Keepthe equipment packaging. To fully protect the device against vibration, dust and moistureduring transportation or storage use the original packaging or your own packaging materialsuitable for transport or storage, respectively.
Establish all connections as long as the unit is switched off. Use the shortest possible high-quality cables for all connections.
DANGER!Electric shock caused by high voltages at the power amplifier outputThe output voltages of modern high-performance amplifiers may result in deathor serious injury.
Never touch the bare ends of loudspeaker cables when the amplifier is on.
Installation and operation
power amplifier
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NOTICE!Magnetic fieldsThe device generates strong magnetic fields that can interfere with the functionof poorly shielded devices. The strongest magnetic fields are directly above andbelow the power amplifier. Therefore, never place sensitive devices such as pre-amplifiers, radio transmission systems, or tape decks directly above or below thepower amplifier. When installing the power amplifier into a rack, you should placeit in the lowest position, and further equipment such as pre-amplifiers in thehighest position.
Installation and operation
E4-130, E4-250
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Depending on the individual application, the amplifier can be used in different operationmodes:
Stereo mode
The two amplifier channels operate independently of one another, eitherchannel (A and B) is amplified and connected to loudspeakers, the volume canbe controlled separately for the two outputs.
Parallel mode
The two amplifier channels receive the same input signal from channel A andloudspeakers are connected to each amplifier, the volume is controlled via thecontrol knob for channel A.
Bridged mode
The two amplifier channels are internally connected in such a way that twicethe output power is available. Only the input signal from channel A is amplifiedand loudspeakers are connected only to the correspondingly marked output.The volume is controlled via the control knob for channel A.
Possible operation modes
Installation and operation
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For each output of the amplifier, the total impedance resulting from the loudspeakers con‐nected to it must not be below the allowed minimal impedance of the amplifier output. If youconnect more than one loudspeaker to an amplifier output, please note the following:
n If the loudspeakers are connected in a series, the individual impedances will be added up.n If the loudspeakers are connected in parallel, the reciprocal of the total impedance equals
the sum of the reciprocals of the individual impedances.
Example: If you have two loudspeakers with the same impedance, their impedance doubles ifthey are connected in a series, their impedance halves if they are connected in parallel.
For detailed information related to this topic please refer to our Online Guide ‘PA Speakers’(www.thomann.de).
The device has been designed for rack mounting in a standard 19-inch rack; it occupies tworack units.
Rack mounting
Installation and operation
E4-130, E4-250
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5 Connections and operating elements
Front panel
Connections and operating elements
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1 [POWER]
Mains switch. Turns the device on and off. The corresponding LED lights up green when the device is turned on.
In standby mode, the LED lights red. As soon as the unit receives a signal, it switches back to normal mode and the LEDwill light up green again.
2 [CH-1], [CH-2],[CH-3], [CH-4]
Volume control for the respective channel
3 [PAR] Lights up when the respective channel pair is operated in Parallel mode.
4 [BRI] Lights up when the respective channel pair is operated in Bridged mode.
5 [SIG] Indicates the presence of an input signal.
Connections and operating elements
E4-130, E4-250
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6 [CLIP] Lights under the following conditions:
n Channel overload.Reduce in this case the volume until the LED goes out.
n Output short circuit.Turn off the device immediately, correct the short circuit and turn on the device again.
7 [PRO] Lights under the following conditions:
n Three to five seconds after switching on or off when the device is in an unstable condition.n No speaker connected.n The temperature of the power amp blocks has reached 85 °C.n One or more protection circuits have been triggered, or the device is faulty.
Connections and operating elements
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Rear panel
Connections and operating elements
E4-130, E4-250
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8 IEC chassis connector for the power supply of the device.
9 [BREAKER]
Resettable electronic fuse. If the fuse is triggered, fix the cause and then push the button to reset the fuse.
10 [INPUT]
XLR chassis sockets as inputs for channels 1 to 4
11 [OUTPUT]
speakON chassis connectors as speaker outputs (1+, 2+: positive; 1–, 2–: negative) for channels 1 to 4
12 Selector switch for the operating mode of the respective channel pair
n Par: Parallel moden Str: Stereo moden Bri: Bridged mode
13 [LIMIT]
Limits the output level so that the distortion is at most 5%.
Connections and operating elements
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14 [Gnd / Lift]
Ground / lift switch. If hum is caused by a ground loop, you can use this switch to disconnect the connectionbetween the earth pin of the device and the signal ground of the device.
15 [Stand-by ON | OFF]
On / off switch for standby function. If the standby function is enabled, the device automatically switches to standbymode after thirty minutes without any input signal.
Connections and operating elements
E4-130, E4-250
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6 Technical specifications
the t.amp E4-130 (item no. 348232) the t.amp E4-250 (item no. 348233)
Output power (RMS), stereo, 8 Ω 4 × 130 W 4 × 250 W
Output power (RMS), stereo, 4 Ω 4 × 200 W 4 × 400 W
Output power (RMS), bridged, 8 Ω 2 × 400 W 2 × 800 W
Max. power consumption 1500 W @ 4 Ω 2700 W @ 4 Ω
Frequency response, ±0,5 dB 20 Hz … 20 kHz
Input sensitivity 1000 mV
Class AB
Signal-to-noise ratio ≥ 94 dB
THD ≤ 0.05 %
Crosstalk (at rated power @ 8 Ω, 1 kHz) > 64 dB
Damping factor (at rated power @ 8 Ω, 1 kHz) > 200
Technical specifications
power amplifier
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the t.amp E4-130 (item no. 348232) the t.amp E4-250 (item no. 348233)
Slew rate 15 V / µs
Inputs XLR sockets
Input impedance 20 kΩ (balanced), 10 kΩ (unbalanced)
Outputs speakON chassis connector
Operating supply voltage AC 230 V , 50 Hz
Dimensions (W × H × D) 482 mm × 88 mm × 408 mm
Weight 12.9 kg 15.0 kg
Technical specifications
E4-130, E4-250
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7 Plug and connection assignment
This chapter will help you select the right cables and plugs to connect your valuable equip‐ment in such a way that a perfect sound experience is ensured.
Please note these advices, because especially in ‘Sound & Light’ caution is indicated: Even if aplug fits into the socket, an incorrect connection may result in a destroyed power amp, a shortcircuit or ‘just’ in poor transmission quality!
Unbalanced transmission is mainly used in semi-professional environment and in hifi use.Instrument cables with two conductors (one core plus shielding) are typical representatives ofthe unbalanced transmission. One conductor is ground and shielding while the signal is trans‐mitted through the core.
Unbalanced transmission is susceptible to electromagnetic interference, especially at lowlevels, such as microphone signals and when using long cables.
In a professional environment, therefore, the balanced transmission is preferred, because thisenables an undisturbed transmission of signals over long distances. In addition to the conduc‐tors ‘Ground’ and ‘Signal’, in a balanced transmission a second core is added. This also transfersthe signal, but phase-shifted by 180°.
Introduction
Balanced and unbalanced trans‐mission
Plug and connection assignment
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Since the interference affects both cores equally, by subtracting the phase-shifted signals, theinterfering signal is completely neutralized. The result is a pure signal without any noise inter‐ference.
1 Ground, shielding
2 Signal (in phase, +)
3 Signal (out of phase, –)
1 Ground, shielding
2 Signal
3 Bridged to pin 1
XLR plug (balanced)
XLR plug (unbalanced)
Plug and connection assignment
E4-130, E4-250
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1, + Signal 1 (in phase)
1, – Signal 1 (180 degree phase shift)
2, + Signal 2 (in phase)
2, – Signal 2 (180 degree phase shift)
NL4 mounting connectors
Plug and connection assignment
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8 Cleaning
The fan grids of the device must be cleaned on a regular basis to remove dust and dirt. Beforecleaning, switch off the device and disconnect AC-powered devices from the mains. Use a lint-free damp cloth for cleaning. Never use solvents or alcohol for cleaning.
Fan grids
Cleaning
E4-130, E4-250
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9 Protecting the environment
For the transport and protective packaging, environmentally friendly materials have beenchosen that can be supplied to normal recycling.
Ensure that plastic bags, packaging, etc. are properly disposed of.
Do not just dispose of these materials with your normal household waste, but make sure thatthey are collected for recycling. Please follow the notes and markings on the packaging.
This product is subject to the European Waste Electrical and Electronic Equipment Directive(WEEE). Do not dispose with your normal household waste.
Dispose of this device through an approved waste disposal firm or through your local wastefacility. When discarding the device, comply with the rules and regulations that apply in yourcountry. If in doubt, consult your local waste disposal facility.
Disposal of the packaging mate‐rial
Disposal of your old device
Protecting the environment
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Musikhaus Thomann e.K. · Treppendorf 30 · 96138 Burgebrach · Germany · www.thomann.de
